U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
202-366-4000
Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations
| REPORT |
| This fact sheet is an archived publication and may contain dated technical, contact, and link information |
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| Publication Number: FHWA-HRT-20-062 Date: November 2020 |
Publication Number: FHWA-HRT-20-062 Date: November 2020 |
PDF Version (1.89 MB)
Technical Report Documentation Page
| 1. Report No.
FHWA-HRT-20-062 |
2. Government Accession No. | 3 Recipient's Catalog No. | ||
| 4. Title and Subtitle
Developing Crash-Modification Factors for High-Friction Surface Treatments: Friction Change Report |
5. Report Date
November 2020 |
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| 6. Performing Organization Code | ||||
| 7. Author(s)
D.K. Merritt, R.A. Tallon, and R.P. Watson |
8. Performing Organization Report No. | |||
| 9. Performing Organization Name and Address
VHB |
10. Work Unit No. (TRAIS) | |||
| 11. Contract or Grant No.
DTFH61-13-D-00001 |
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| 12. Sponsoring Agency Name and Address
Federal Highway Administration |
13. Type of Report and Period Covered
Final Report; December 2015‐August 2019 |
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| 14. Sponsoring Agency Code
HRDS-20 |
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| 15. Supplementary Notes
This report was prepared for the Federal Highway Administration (FHWA) Office of Safety and Operations Research and Development under Contract DTFH61-13-D-0001. The FHWA program and task manager for this project was Roya Amjadi (HRDS-20; ORCID: 0000-0001-7672-8485). Andy Mergenmeier (DTS-RC-BAL-1; ORCID: 0000-0003-4837-6528) and Joseph Cheung (HAS-HSST) contributed to this study. |
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| 16. Abstract
This report documents results and observations from friction testing of high-friction surface treatments (HFSTs) as part of an FHWA research study, Developing Crash-Modification Factors for High-Friction Surface Treatments. This larger study provides high-quality crash-modification factors and benefit–cost ratios for HFST with calcined bauxite aggregate and recommends materials and specifications for applying HFST to effectively reduce roadway departure crashes. Friction testing was performed to document the friction of the HFST and underlying pavement. For a number of sites, friction testing was performed on the existing pavement surface before HFST installation and on the HFST after installation. In some cases, testing of the pavement leading up to and away from existing HFST sites was used to estimate the friction of the underlying pavement for comparison to HFST friction. To evaluate friction change of HFST over time, friction testing was also performed on several older HFST installations where previous friction data had been collected. All friction testing was performed with a highway friction tester, a continuous fixed-slip measurement device that provides a continuous plot of friction reported in 0.30-meter (1-foot) increments through the section of pavement tested. The advantage of continuous friction measurement is that variations in friction (e.g., through a curve) can be documented. The friction data collected during this research and documented in this report were evaluated for friction change before and after HFST installation, friction change of the HFST and existing pavement over time, and friction change within a curve. |
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| 17. Key Words
High-friction surface treatment, HFST, highway friction tester, HFT, continuous friction measurement |
18. Distribution Statement
No restrictions. This document is available to the public through the National Technical Information Service, Springfield, VA 22161. |
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| 19. Security Classification (of this report) Unclassified |
20. Security Classification (of this page) Unclassified |
21. No. of Pages
43 |
22. Price
N/A |
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| Form DOT F 1700.7 (8-72) | Reproduction of completed page authorized |
